title: Inscuteable and numb mediate asymmetric muscle progenitor cell divisions during Drosophila myogenesis.
abstract: Each larval hemisegment comprises approximately 30 uniquely specified somatic muscles. These derive from muscle founders that arise as distinct sibling pairs from the division of muscle progenitor cells. We have analyzed the progenitor cell divisions of three mesodermal lineages that generate muscle (and pericardial cell) founders. Our results show that Inscuteable and Numb proteins are localized as cortical crescents on opposite sides of dividing progenitor cells. Asymmetric segregation of Numb into one of the sibling myoblasts depends on inscuteable and is essential for the specification of distinct sibling cell fates. Loss of numb or inscuteable results in opposite cell fate transformations-both prevent sibling myoblasts from adopting distinct identities, resulting in duplicated or deleted mesodermal structures. Our results indicate that the muscle progenitor cell divisions are intrinsically asymmetric; moreover, the involvement of both inscuteable and numb/N suggests that the specification of the distinct cell fates of sibling myoblasts requires intrinsic and extrinsic cues.
authors.affiliation: Centro de Biologia Molecular "Severo Ochoa," C.S.I.C.-Universidad Autonoma, 28049 Madrid, Spain.
authors.forename: A
authors.initials: A
authors.lastname: Carmena
authors.forename: B
authors.initials: B
authors.lastname: Murugasu-Oei
authors.forename: D
authors.initials: D
authors.lastname: Menon
authors.forename: F
authors.initials: F
authors.lastname: Jiménez
authors.forename: W
authors.initials: W
authors.lastname: Chia
mesh_terms: D000818:Animals; D002455:Cell Division / Q000502:physiology; D019070:Cell Lineage / Q000235:genetics / Q000502:physiology; D003598:Cytoskeletal Proteins / Q000032:analysis / Q000235:genetics / Q000502:physiology*; D004330:Drosophila / Q000196:embryology*; D029721:Drosophila Proteins; D004625:Embryo, Nonmammalian / Q000737:chemistry; D015870:Gene Expression / Q000235:genetics / Q000502:physiology; D007605:Juvenile Hormones / Q000032:analysis / Q000235:genetics / Q000502:physiology*; D008648:Mesoderm / Q000737:chemistry; D009132:Muscles / Q000166:cytology* / Q000196:embryology*; D009154:Mutation; D009479:Neuropeptides; D010641:Phenotype; D013234:Stem Cells / Q000502:physiology*
chemical_list: D003598:Cytoskeletal Proteins; D029721:Drosophila Proteins; D007605:Juvenile Hormones; D009479:Neuropeptides; C098678:insc protein, Drosophila; C060606:numb protein, Drosophila